Pump jack



J y ,1945- w. E. CUMMINS 2,380,635

PUMP JACK Filed June i2, 1944 2 Sheets-Sheet 1 v A ag/vp Patented July31, 1945 UNITED STATES PATENT OFFICE- Walter E. (iu mm ifsffo dngeles,Calif. I Application June 12, 1521:5370. 539,958

Claims.

This invention relates to a pump jack.

The general object of the invention is to provide a. pump jack includingnovel balancing A further object of the invention is to provide a pumpJack which is adapted to reciprocate a sucker rod and wherein the pumpjack includes novel means for balancing the weight to be lifted wherebya more uniform lift is secured than is present in the conventionalconstruction.

A more specific object of the invention is to provide a pump jack havinga weighted arm pivoted thereon and arranged to move in a limited mannerrelative to the walking beam.

A iurther object of the invention is to provide a pumpjack including awalking beam and a weighted arm mounted on the walking beam tonetherwith novel link means for operating the Other objects and the advantagesof the invention will be apparent from the following description takenin connection with the accomv drawings, wherein:

Fig. 1 is a side elevation of a pump jack cmthe ieatures of my inventionand showing the parts in the position they assume when fluid is beinglifted in the well, and

Fig. 2 is a view similar to Fig. 1 showing the parts in the non assumedwhen the sucker rod is moving downwardly in the well.

Rafe to the drawings by reference charactars, I have shown my inventionas embodied in a pump jack which is indicated generally at ID.

As shown the pump iack includes a base I, hav-' the member 23 theposition of the fulcrum it may be shifted along the walking beam lb.

The arm 2| is provided, adjacent the head it, with a weight 29 and atthe end remote from the head |6 is provided with a weight 80.

To operate the device I provide a link 3| which is pivoted at 32 on theend of the walking beam and is remote from the head I6. The link 3| atits other end is connected at 33 to a second link 34. The link 34 at itslower end is connected at 35 to a crank 38 which is adapted to beoperated by suitable gear means fl, driven as by a belt 38.

Intermediate its length the link ii is pivotally connected at 39 to alink 4. which, in turn, is pivoted as at 4| to the arm 2|.

As a result, when the crank It is operated, the link 34 will bereciprocated thus rocking the hnk 3i and alternately lifting andlowering the link 40 to raise and lower the pivot ti and thus tend torock the arm 2|.

rod in the well while the weights 2t and 8d such that when the fulcrumit is properly placed the movement of the arm 2| will be gov in Thewalking beam is provided at one end with arm which is indicatedgenerally at 2|; This arm is guided for rocking action at the head endthereof by working in a channel member 22 and at the other end is guidedby link means (to bepresently described). Intermediate its ends the arm2| is provided with a fulcrum member 23. This fulcrum member includes afulcrum 24.

such fashion, as will be later dbed, so as to provide a smooth pumpingoperation Thearm ii is provided with tip portions #32 and 43 and may beprovided with bumpers st and 55, arranged adjacent to the tip portions.

that the partsare in the tien shown in Fig. 1, it will be noted that theiii-rs. as is moving downwardly, thus p downwardly on the link 3| andlink 68 and A list; on the pin M, and since the portion 65 cents thewalking beam i6 w be is rocked so that the head it in upwardly, t fluidm b lifting the sueker'rod is and raised in the well. As soon as the.crzu "passes beyondits lower center the link as is arm 2| to rock aboutthe fulcrum 26 and causing which engages the upper surface of thewalkingv beam Ii andincludes anarm 2!, having slots it therein whichreceive securing means 21 such as Byloosenimthescrewszl andshiftingpushed upwardly, thus I the link 58 and pushing the pin 5i upw, thus ranthe the portion s: and bumper t l-to move downwardly and engage thewalking beam 1 i: scent to the head l6. This operation occurs when the vhead It has reached its upper limit of movement. The head then remainsstationary mo= mentarily until the portion 42 and bumper is contact thewalking beam, whereupon the head 16 moves downwardly as the crank 36moves upthen momentarily movement of the head it and sucker rod I8 willcease while the link 34 is moving downwardly and rocking the arm 2| fromthe position of Fig. 2 to the position of Fig. 1.

- This movement of the arm without causing consequent movementv of thesucker rod builds up energy during its movement so that when the portion43 and bumper 45 engage the walking beam l their energy is suflicient toovercome the initial energy required to start movement of the fluidupwardly in the well. Since the weight 20 balances the weight of thesucker rod there is no-power required to lift the sucker rod andthus'there is no. requirement for sudden application of power at thetime the fluid column starts its lift. Consequently the motor, engine orother prime mover which drive the crank 38 is doing practically constantwork throughout the entire pumping cycle and thus a motor of lighterhorsepower may be employed with my improved pump jack.

From the foregoing description it will be apparent that I have, inventeda novel pump jack which is simple in construction and which can beoperated by a, prime mover actuating at practical- 1y "constanthorsepower output.

, Having thus described my invention, I claim:

1. A counterbalance for a walking beam including an arm, a weight oneach end of the arm,

means intermediate the length oi. said arm adapted to pivotally supportsaid arm on a walking beam, said am including portions at each endadapted to engage a walking beam as the arm rocks, a link pivotallyengaging said arm between the fulcrum and one end portion of the arm,and means adapted to pivotally connect'said link to a crank member.

3. A counterbalance for a walking beam including an arm, meansadjustable along the arm and disposed intermediate the length of saidarm adapted to pivotally support said arm on a walking beam, weightmeans secured to said arm adjacent to each end thereof, each end/of saidarm including a portion adapted to engage a walking from the fulcrum,means to pivotaliy connect said other link tosaid first link, and meansto rock said first link;

5. A counterbalance. for a walking beam including a link adapted to bedisposed alongside a walking beam and adapted to be pivotallyconnected'at one end to a walking ebeam, asecond link having one endpivotally connected to the other end of said first link, an arm adaptedto be disposed above a walking beam, 2:, fulcrum memberadjustablymounted upon said arm and disposed intermediate the length ofsaid arm and adapted to engage a walking beam, weight means secured onsaid arm adjacent to each end thereof, means to guide said arm; as itrocks about its fulcrum; cushion means disposed upon each end portion ofsaid arm adapted to engage the walking beam, a third link pivotallyengaging said arm, and means to pivotally connect said third link tosaid first link.

WALTER E. C. k

